EP3482478A1 - Stator of an electrical machine - Google Patents

Stator of an electrical machine

Info

Publication number
EP3482478A1
EP3482478A1 EP17722788.1A EP17722788A EP3482478A1 EP 3482478 A1 EP3482478 A1 EP 3482478A1 EP 17722788 A EP17722788 A EP 17722788A EP 3482478 A1 EP3482478 A1 EP 3482478A1
Authority
EP
European Patent Office
Prior art keywords
conductor
conductor ends
height
section
cross
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP17722788.1A
Other languages
German (de)
French (fr)
Inventor
Stefan Ossenkopp
Tobias HEIN
Fabian Lange
Patrick PRIEBE
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP3482478A1 publication Critical patent/EP3482478A1/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • H02K3/28—Layout of windings or of connections between windings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/08—Devices involving relative movement between laser beam and workpiece
    • B23K26/082—Scanning systems, i.e. devices involving movement of the laser beam relative to the laser head
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/08—Devices involving relative movement between laser beam and workpiece
    • B23K26/0869—Devices involving movement of the laser head in at least one axial direction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/20—Bonding
    • B23K26/21—Bonding by welding
    • B23K26/24—Seam welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/20—Bonding
    • B23K26/21—Bonding by welding
    • B23K26/24—Seam welding
    • B23K26/26—Seam welding of rectilinear seams
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/16—Stator cores with slots for windings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/0056—Manufacturing winding connections
    • H02K15/0068—Connecting winding sections; Forming leads; Connecting leads to terminals
    • H02K15/0081—Connecting winding sections; Forming leads; Connecting leads to terminals for form-wound windings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/10—Applying solid insulation to windings, stators or rotors
    • H02K15/105—Applying solid insulation to windings, stators or rotors to the windings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • H02K3/12—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors arranged in slots
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/36—Electric or electronic devices
    • B23K2101/38—Conductors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information

Definitions

  • the invention is based on a stator of an electrical machine according to the preamble of the main claim.
  • a stator of an electric machine from EP 1 364 440 B1 which has stator slots and conductor elements arranged in the stator slots, each having two conductor ends.
  • Several juxtaposed conductor ends of different conductor elements are each connected to each other by means of a provided on the end faces of the respective conductor ends weld without additional material.
  • the interconnected conductor ends each form a common quadrangular conductor cross-section having a height H and a width B, wherein the height H of the height h of a single cross-section of the conductor ends corresponds and the width B of the common conductor cross-section of the sum of the widths b of the individual cross-sections Leader ends.
  • the welded connection is provided in each case in the direction of the width B between two unmelted edge portions of the outermost conductor ends.
  • the weld cross section in the direction of the height H is comparatively low, which affects the
  • Welding requires material that comes out of the molten weld pool and allows the surface of the weld to sink in with respect to the faces of the edge portions.
  • the sunken welded joint has the advantage that it does not increase the winding head in the axial direction of the stator, so that corresponding space is saved.
  • the welded joint is formed in a plan view of the end faces of the respective conductor ends oval-shaped or circular. Furthermore, the weld has seen in the direction of the longitudinal extent of the weld an oval-shaped cross-section.
  • common conductor cross section is greater than two, since in this way the sinking of the molten weld pool is facilitated and thus an increase of the winding head is prevented in the axial direction.
  • the cross section of the conductor ends in each case has a height h and a width b, wherein the ratio of the width b to the height h of
  • Cross section of the conductor ends is greater than or equal to one. In this way, a favorable aspect ratio is created for two to be connected conductor ends, which facilitates sinking of the molten weld pool.
  • ratio of the width b to the height h of the cross section of the conductor ends greater than or equal to 1.4 flat wires can be used, which make low demands on the painting process of the enameled wire.
  • Fig.l shows a three-dimensional view of a stator of an electric machine, to which the invention can be applied
  • FIG. 3 shows a plan view of the welded connection according to FIG.
  • FIG. 1 shows a three-dimensional view of a stator of an electrical machine to which the invention can be applied.
  • the stator 1 of the electric machine has a laminated stator core 2 with stator slots 3.
  • stator slots 3 In the stator 3 are conductor elements 4 of an electrical winding
  • the conductor ends 5 of the plurality of conductor elements 4 must be in accordance with a so-called winding scheme
  • Weld 8 is provided at the end faces 6 of the respective conductor ends 5 and is by means of a laser and without the use of a
  • the welded joints 8 can after the
  • Welding are each enclosed by an insulation, not shown, to avoid sparkover between conductor ends 5 different electrical phases.
  • FIG. 2 shows a side view of a welded connection according to the invention between two conductor ends of two conductor elements.
  • the end faces 6 of the conductor ends 5 to be connected are provided flush with each other.
  • the individual cross sections of the conductor ends 5 each have a height h and a width b.
  • the conductor ends 5 to be joined together each form a common quadrangular, in particular rectangular, conductor cross-section 9, which has a height H and a width B, the height H of the height h of the
  • the common conductor cross-section 9 so the cross section is meant, which results from the juxtaposition of the square, in particular rectangular individual cross-sections of the conductor ends 5.
  • the individual cross sections have, for example, rounded edges.
  • the ratio of the width B to the height H of the common conductor cross-section 9 is greater than two.
  • the ratio of the width b to the height h of each individual cross section of the conductor ends 5 is greater than or equal to one.
  • the conductor ends 5 to be joined together have a common circumference formed by two opposite wide peripheral sides U1 and two opposite narrow peripheral sides U2. According to the embodiment in Figure 2, two conductor ends 5 by means of
  • the welded joint 8 is provided in each case in the direction of the width B between two unfused edge portions 10 of the outermost conductor ends 5.
  • the welded joint 8 is thus designed such that seen in the direction of the width B at the two opposite edges of the common conductor cross-section 9, the edge portions 10th
  • Conductor cross-section 9 and the surface of the welded joint 8 with respect to the end faces 6 of the edge portions 10 is consequently sunken.
  • the reference point for the sinking of the welded joint may also be the entire end face 6 of the conductor ends 5 before welding.
  • the welded connection 8 protrudes with its extension L2 at both wide peripheral sides U1 against the edge sections 10 of the outermost conductor ends 5. Furthermore, the welded joint 8 protrudes on both sides in relation to the peripheral sides Ul in the area immediately below the welded joint 8.
  • the surface of the welded joint 8 is sunken over the entire extent LI of the welded joint 8 by a certain depth T, so that a
  • Recess 12 is formed.
  • the material from the recess 12 has run into the two laterally projecting sections 8.1 of the welded joint 8.
  • Weld 8 has in the direction of the longitudinal extent LI
  • Weld 8 seen an oval-shaped cross-section.
  • the welded joint 8 is in the direction of the end faces of the respective
  • the production of the welded joint 8 according to the invention takes place according to the following method steps: First, the conductor ends to be connected are stripped and arranged side by side. Subsequently, the material is locally melted at the end faces 6 of the conductor ends 5 by oscillating reciprocating a laser beam, wherein the pivoting range of the laser is set such that the forming weld pool between a non-melted edge portion 10 of the two outermost conductor elements 4 and a not melted edge portion 10 of the other outermost conductor element 4 is held.
  • Welding parameters in particular the power of the laser, a beam thickness of the laser and a welding time are adjusted so that the extension of the
  • the welded together conductor ends 5, in particular the edge portions 10 of the conductor ends 5, may each be rounded at their edges to achieve by reducing burrs and peaks a reduced field line concentration and thus a higher insulation or dielectric strength. At the rounded, welded together conductor ends 5 can after the

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Power Engineering (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture Of Motors, Generators (AREA)
  • Windings For Motors And Generators (AREA)

Abstract

A stator of an electrical machine which has stator slots and conductor elements arranged in the stator slots, which conductor elements each have two conductor ends, is already known. A plurality of conductor ends, which are situated next to one another, of different conductor elements are in each case connected to one another by means of a weld connection, which is provided at the end sides of the conductor ends in question, without additional material. The conductor ends which are connected to one another in each case form a common rectangular conductor cross section which has a height H and a width B, wherein the height H corresponds to the height h of an individual cross section of the conductor ends, and the width B of the common conductor cross section is made up of the sum of the widths b of the individual cross sections of the conductor ends. The weld connection is in each case provided, as seen in the direction of the width B, between two non-melted edge sections of the outermost conductor ends. The weld cross section in the direction of the height H is comparatively low, this having effects on the long-term mechanical strength of the weld connection and, during operation of the electrical machine, possibly causing temperature peaks at the weld connection as a result of a high current density. In the case of the stator according to the invention, the mechanical strength of the weld connection is increased. According to the invention, it is provided that the extent (L2) of the weld connection (8) in the direction of the height (H) is greater, at least in sections, than the height (H) of the common conductor cross section (9), and the surface of the weld connection (8) is consequently sunken in relation to the end sides (6) of the edge sections (10).

Description

Beschreibung Titel  Description title
Stator einer elektrischen Maschine  Stator of an electric machine
Stand der Technik Die Erfindung geht aus von einem Stator einer elektrischen Maschine nach der Gattung des Hauptanspruchs. PRIOR ART The invention is based on a stator of an electrical machine according to the preamble of the main claim.
Es ist schon ein Stator einer elektrischen Maschine aus der EP 1 364 440 Bl bekannt, der Statornuten und in den Statornuten angeordnete Leiterelemente aufweist, die jeweils zwei Leiterenden haben. Mehrere nebeneinander liegende Leiterenden verschiedener Leiterelemente sind jeweils mittels einer an den Stirnseiten der betreffenden Leiterenden vorgesehenen Schweißverbindung ohne Zusatzwerkstoff miteinander verbunden. Die miteinander verbundenen Leiterenden bilden jeweils einen gemeinsamen viereckigen Leiterquerschnitt, der eine Höhe H und eine Breite B aufweist, wobei die Höhe H der Höhe h eines Einzelquerschnitts der Leiterenden entspricht und sich die Breite B des gemeinsamen Leiterquerschnitts aus der Summe der Breiten b der Einzelquerschnitte der Leiterenden ergibt. Die Schweißverbindung ist jeweils in Richtung der Breite B gesehen zwischen zwei nicht aufgeschmolzenen Randabschnitten der äußersten Leiterenden vorgesehen. Der Schweißquerschnitt in Richtung der Höhe H ist vergleichsweise gering, was Auswirkungen auf die  A stator of an electric machine from EP 1 364 440 B1 is already known, which has stator slots and conductor elements arranged in the stator slots, each having two conductor ends. Several juxtaposed conductor ends of different conductor elements are each connected to each other by means of a provided on the end faces of the respective conductor ends weld without additional material. The interconnected conductor ends each form a common quadrangular conductor cross-section having a height H and a width B, wherein the height H of the height h of a single cross-section of the conductor ends corresponds and the width B of the common conductor cross-section of the sum of the widths b of the individual cross-sections Leader ends. The welded connection is provided in each case in the direction of the width B between two unmelted edge portions of the outermost conductor ends. The weld cross section in the direction of the height H is comparatively low, which affects the
mechanische Dauerfestigkeit der Schweißverbindung hat und im Betrieb der elektrischen Maschine Temperaturspitzen an der Schweißverbindung infolge einer hohen Stromdichte bewirken kann. mechanical fatigue strength of the welded joint and can cause temperature peaks at the weld joint due to a high current density during operation of the electrical machine.
Vorteile der Erfindung Advantages of the invention
Der erfindungsgemäße Stator einer elektrischen Maschine mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, dass die mechanische Festigkeit der Schweißverbindung erhöht und die Temperaturspitzen an der The stator of an electric machine according to the invention with the characterizing features of the main claim has the advantage that the mechanical strength of the welded joint increases and the temperature peaks on the
Schweißverbindung zumindest verringert werden, indem die Erstreckung der Welded joint are at least reduced by the extension of the
Schweißverbindung in Richtung der Höhe H zumindest abschnittsweise größer ist als die Höhe H des gemeinsamen Leiterquerschnitts. Die Schweißverbindung steht dadurch in Richtung der Höhe H gesehen gegenüber den Randabschnitten der äußersten Leiterenden vor. Das beidseitige Vorstehen bzw. Auskragen der Welded connection in the direction of the height H at least partially greater than the height H of the common conductor cross section. The welded joint is thus projected in the direction of the height H, as opposed to the edge portions of the outermost conductor ends. The two-sided projection or cantilever of the
Schweißverbindung benötigt Material, das aus dem aufgeschmolzenen Schweißbad kommt und die Oberfläche der Schweißverbindung in Bezug auf die Stirnseiten der Randabschnitte einsinken lässt. Die eingesunkene Schweißverbindung hat den Vorteil, dass sie den Wickelkopf in axialer Richtung des Stators gesehen nicht erhöht, so dass entsprechend Bauraum eingespart wird. Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Welding requires material that comes out of the molten weld pool and allows the surface of the weld to sink in with respect to the faces of the edge portions. The sunken welded joint has the advantage that it does not increase the winding head in the axial direction of the stator, so that corresponding space is saved. The measures listed in the dependent claims are advantageous
Weiterbildungen und Verbesserungen des im Hauptanspruch angegebenen Stators möglich.  Further developments and improvements of the main claim specified stator possible.
Gemäß einer vorteilhaften Ausführung ist die Schweißverbindung bei einer Draufsicht auf die Stirnseiten der betreffenden Leiterenden ovalförmig oder kreisförmig ausgebildet. Weiterhin hat die Schweißverbindung in Richtung der Längserstreckung der Schweißverbindung gesehen einen ovalförmigen Querschnitt. According to an advantageous embodiment, the welded joint is formed in a plan view of the end faces of the respective conductor ends oval-shaped or circular. Furthermore, the weld has seen in the direction of the longitudinal extent of the weld an oval-shaped cross-section.
Besonders vorteilhaft ist, wenn das Verhältnis der Breite B zur Höhe H des It is particularly advantageous if the ratio of the width B to the height H of
gemeinsamen Leiterquerschnitts größer als zwei ist, da auf diese Weise das Einsinken des aufgeschmolzenen Schweißbades erleichtert wird und somit eine Erhöhung des Wickelkopfes in axialer Richtung verhindert wird. common conductor cross section is greater than two, since in this way the sinking of the molten weld pool is facilitated and thus an increase of the winding head is prevented in the axial direction.
Weiterhin vorteilhaft ist, wenn der Querschnitt der Leiterenden jeweils eine Höhe h und eine Breite b aufweist, wobei das Verhältnis von der Breite b zur Höhe h des It is also advantageous if the cross section of the conductor ends in each case has a height h and a width b, wherein the ratio of the width b to the height h of
Querschnitts der Leiterenden jeweils größer gleich eins ist. Auf diese Weise wird auch für zwei zu verbindende Leiterenden ein günstiges Seitenverhältnis geschaffen, das ein Einsinken des aufgeschmolzenen Schweißbades erleichtert. Bei der Verwendung des Verhältnisses von der Breite b zur Höhe h des Querschnitts der Leiterenden jeweils größer gleich 1,4 können Flachdrähte verwendet werden, die geringe Anforderungen an den Lackierprozess des Lackdrahtes stellen.  Cross section of the conductor ends is greater than or equal to one. In this way, a favorable aspect ratio is created for two to be connected conductor ends, which facilitates sinking of the molten weld pool. When using the ratio of the width b to the height h of the cross section of the conductor ends greater than or equal to 1.4 flat wires can be used, which make low demands on the painting process of the enameled wire.
Sehr vorteilhaft ist es, wenn der Querschnitt der Leiterenden jeweils quadratisch oder rechteckförmig, insbesondere mit abgerundeten Kanten, ausgebildet ist, da auf diese Weise ein hoher elektrischer Füllfaktor für die elektrische Maschine ermöglicht wird. Zeichnung It is very advantageous if the cross section of the conductor ends is in each case square or rectangular, in particular with rounded edges, since in this way a high electrical filling factor for the electrical machine is made possible. drawing
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert. An embodiment of the invention is shown in simplified form in the drawing and explained in more detail in the following description.
Fig.l zeigt eine dreidimensionale Ansicht eines Stators einer elektrischen Maschine, bei der die Erfindung angewendet werden kann, Fig.l shows a three-dimensional view of a stator of an electric machine, to which the invention can be applied,
Fig.2 eine Seitenansicht einer erfindungsgemäßen Schweißverbindung zwischen zwei Leiterenden zweier Leiterelemente und A side view of a welded joint according to the invention between two conductor ends of two conductor elements and
Fig.3 eine Draufsicht auf die Schweißverbindung nach Fig.2.  3 shows a plan view of the welded connection according to FIG.
Beschreibung des Ausführungsbeispiels Fig.l zeigt eine dreidimensionale Ansicht eines Stators einer elektrischen Maschine, bei der die Erfindung angewendet werden kann. DESCRIPTION OF THE EMBODIMENT FIG. 1 shows a three-dimensional view of a stator of an electrical machine to which the invention can be applied.
Der Stator 1 der elektrischen Maschine weist ein Statorblechpaket 2 mit Statornuten 3 auf. In den Statornuten 3 sind Leiterelemente 4 einer elektrischen Wicklung The stator 1 of the electric machine has a laminated stator core 2 with stator slots 3. In the stator 3 are conductor elements 4 of an electrical winding
vorgesehen, die jeweils zwei Leiterenden 5 haben. Um eine elektrische Wicklung, beispielsweise eine Mehrphasenwicklung, zu bilden, müssen die Leiterenden 5 der Vielzahl von Leiterelementen 4 gemäß einem sogenannten Wickelschema provided, each having two conductor ends 5. In order to form an electrical winding, for example a polyphase winding, the conductor ends 5 of the plurality of conductor elements 4 must be in accordance with a so-called winding scheme
stoffschlüssig miteinander verbunden werden. Dazu werden jeweils zwei oder mehr nebeneinander liegende Leiterenden 5 verschiedener Leiterelemente 4 mittels einer Schweißverbindung bzw. einer Schweißnaht 8 miteinander verbunden. Diese cohesively connected to each other. For this purpose, in each case two or more adjacent conductor ends 5 of different conductor elements 4 are connected to one another by means of a welded connection or a welded seam 8. These
Schweißverbindung 8 ist an den Stirnseiten 6 der betreffenden Leiterenden 5 vorgesehen und wird mittels eines Lasers und ohne Verwendung eines Weld 8 is provided at the end faces 6 of the respective conductor ends 5 and is by means of a laser and without the use of a
Zusatzwerkstoffes hergestellt. Die Schweißverbindungen 8 können nach dem Made additional material. The welded joints 8 can after the
Schweißen jeweils von einer nicht dargestellten Isolation umschlossen werden, um Funkenüberschläge zwischen Leiterenden 5 verschiedener elektrischer Phasen zu vermeiden. Welding are each enclosed by an insulation, not shown, to avoid sparkover between conductor ends 5 different electrical phases.
Fig.2 zeigt eine Seitenansicht einer erfindungsgemäßen Schweißverbindung zwischen zwei Leiterenden zweier Leiterelemente. Bei der Ansicht nach Fig.2 sind die gegenüber der Ansicht nach Fig.l gleichbleibenden oder gleichwirkenden Teile durch die gleichen Bezugszeichen gekennzeichnet. Die Stirnseiten 6 der zu verbindenden Leiterenden 5 sind bündig zueinander vorgesehen. Die Einzelquerschnitte der Leiterenden 5 haben jeweils eine Höhe h und eine Breite b. Die miteinander zu verbindenden Leiterenden 5 bilden jeweils einen gemeinsamen viereckigen, insbesondere rechteckförmigen Leiterquerschnitt 9, der eine Höhe H und eine Breite B aufweist, wobei die Höhe H der Höhe h der 2 shows a side view of a welded connection according to the invention between two conductor ends of two conductor elements. In the view according to FIG. 2, the parts which are identical or functionally equivalent to the view of FIG. 1 are identified by the same reference numerals. The end faces 6 of the conductor ends 5 to be connected are provided flush with each other. The individual cross sections of the conductor ends 5 each have a height h and a width b. The conductor ends 5 to be joined together each form a common quadrangular, in particular rectangular, conductor cross-section 9, which has a height H and a width B, the height H of the height h of the
Einzelquerschnitte der Leiterenden 5 entspricht und sich die Breite B des Single cross-sections of the conductor ends 5 corresponds and the width B of the
gemeinsamen Leiterquerschnitts 9 aus der Summe der Breiten b der common conductor cross-section 9 from the sum of the widths b of
Einzelquerschnitte der Leiterenden 5 ergibt. Mit dem gemeinsamen Leiterquerschnitt 9 ist also der Querschnitt gemeint, der sich durch das nebeneinander Anordnen der viereckigen, insbesondere rechteckförmigen Einzelquerschnitte der Leiterenden 5 ergibt. Die Einzelquerschnitte haben beispielsweise abgerundete Kanten. Das Verhältnis der Breite B zur Höhe H des gemeinsamen Leiterquerschnitts 9 ist größer als zwei. Das Verhältnis von der Breite b zur Höhe h jedes Einzelquerschnitts der Leiterenden 5 ist größer gleich eins. Die miteinander zu verbindenden Leiterenden 5 haben einen gemeinsamen Umfang, der durch zwei gegenüberliegende breite Umfangsseiten Ul und zwei gegenüberliegende schmale Umfangsseiten U2 gebildet ist. Nach dem Ausführungsbeispiel in Fig.2 werden zwei Leiterenden 5 mittels derSingle cross sections of the conductor ends 5 results. With the common conductor cross-section 9 so the cross section is meant, which results from the juxtaposition of the square, in particular rectangular individual cross-sections of the conductor ends 5. The individual cross sections have, for example, rounded edges. The ratio of the width B to the height H of the common conductor cross-section 9 is greater than two. The ratio of the width b to the height h of each individual cross section of the conductor ends 5 is greater than or equal to one. The conductor ends 5 to be joined together have a common circumference formed by two opposite wide peripheral sides U1 and two opposite narrow peripheral sides U2. According to the embodiment in Figure 2, two conductor ends 5 by means of
Schweißverbindung 8 verbunden. Die Schweißverbindung 8 ist jeweils in Richtung der Breite B gesehen zwischen zwei nicht aufgeschmolzenen Randabschnitten 10 der äußersten Leiterenden 5 vorgesehen. Die Schweißverbindung 8 wird also derart ausgeführt, dass in Richtung der Breite B gesehen an den beiden gegenüberliegenden Ränder des gemeinsamen Leiterquerschnitts 9 die Randabschnitte 10 Welded 8 connected. The welded joint 8 is provided in each case in the direction of the width B between two unfused edge portions 10 of the outermost conductor ends 5. The welded joint 8 is thus designed such that seen in the direction of the width B at the two opposite edges of the common conductor cross-section 9, the edge portions 10th
unaufgeschmolzen bleiben. Somit verläuft die Schweißnaht 8 mit ihrer remain unfused. Thus, the weld 8 runs with her
Längserstreckung LI nicht über die gesamte Breite B des gemeinsamen LI does not extend over the entire width B of the joint
Leiterquerschnitts 9. Erfindungsgemäß ist vorgesehen, dass die Erstreckung L2 der Schweißverbindung 8 quer, beispielsweise senkrecht, zur Längserstreckung LI in Richtung der Höhe H zumindest abschnittsweise größer ist als die Höhe H des gemeinsamen Conductor cross-section 9. According to the invention it is provided that the extension L2 of the welded joint 8 transversely, for example perpendicular, to the longitudinal extent LI in the direction of the height H at least partially greater than the height H of the common
Leiterquerschnitts 9 und die Oberfläche der Schweißverbindung 8 in Bezug auf die Stirnseiten 6 der Randabschnitte 10 infolgedessen eingesunken ist. Der Bezugspunkt für das Einsinken der Schweißverbindung kann auch die gesamte Stirnseite 6 der Leiterenden 5 vor dem Verschweißen sein. Durch die erfindungsgemäße Ausführung steht die Schweißverbindung 8 mit ihrer Erstreckung L2 an beiden breiten Umfangsseiten Ul gegenüber den Randabschnitten 10 der äußersten Leiterenden 5 vor. Desweiteren steht die Schweißverbindung 8 beidseitig gegenüber den Umfangsseiten Ul im Bereich unmittelbar unterhalb der Schweißverbindung 8 vor. Conductor cross-section 9 and the surface of the welded joint 8 with respect to the end faces 6 of the edge portions 10 is consequently sunken. The reference point for the sinking of the welded joint may also be the entire end face 6 of the conductor ends 5 before welding. As a result of the embodiment according to the invention, the welded connection 8 protrudes with its extension L2 at both wide peripheral sides U1 against the edge sections 10 of the outermost conductor ends 5. Furthermore, the welded joint 8 protrudes on both sides in relation to the peripheral sides Ul in the area immediately below the welded joint 8.
Die Oberfläche der Schweißverbindung 8 ist über die gesamte Erstreckung LI der Schweißverbindung 8 um eine bestimmte Tiefe T eingesunken, so dass eine The surface of the welded joint 8 is sunken over the entire extent LI of the welded joint 8 by a certain depth T, so that a
Vertiefung 12 gebildet ist. Der Werkstoff aus der Vertiefung 12 ist in die beiden seitlich vorstehenden Abschnitte 8.1 der Schweißverbindung 8 gelaufen. Die Recess 12 is formed. The material from the recess 12 has run into the two laterally projecting sections 8.1 of the welded joint 8. The
Schweißverbindung 8 hat in Richtung der Längserstreckung LI der Weld 8 has in the direction of the longitudinal extent LI
Schweißverbindung 8 gesehen einen ovalförmigen Querschnitt. Weld 8 seen an oval-shaped cross-section.
Die Schweißverbindung 8 ist in Richtung auf die Stirnseiten der betreffenden The welded joint 8 is in the direction of the end faces of the respective
Leiterenden gesehen ovalförmig oder kreisförmig ausgeführt. Ladder ends seen oval or circular running.
Die Herstellung der erfindungsgemäßen Schweißverbindung 8 erfolgt nach folgenden Verfahrensschritten: Zunächst werden die zu verbindenden Leiterenden abisoliert und nebeneinander angeordnet. Anschließend wird der Werkstoff an den Stirnseiten 6 der Leiterenden 5 durch pendelndes Hin- und Herbewegen eines Laserstrahls lokal aufgeschmolzen, wobei der Verschwenkbereich des Lasers derart eingestellt ist, dass das sich bildende Schweißbad zwischen einem nicht aufgeschmolzenen Randabschnitt 10 eines der beiden äußersten Leiterelemente 4 und einem nicht aufgeschmolzenen Randabschnitt 10 des anderen äußersten Leiterelementes 4 gehalten ist. Die The production of the welded joint 8 according to the invention takes place according to the following method steps: First, the conductor ends to be connected are stripped and arranged side by side. Subsequently, the material is locally melted at the end faces 6 of the conductor ends 5 by oscillating reciprocating a laser beam, wherein the pivoting range of the laser is set such that the forming weld pool between a non-melted edge portion 10 of the two outermost conductor elements 4 and a not melted edge portion 10 of the other outermost conductor element 4 is held. The
Schweißparameter, insbesondere die Leistung des Lasers, eine Strahldicke des Lasers und eine Schweißzeit, werden derart eingestellt, dass die Erstreckung der Welding parameters, in particular the power of the laser, a beam thickness of the laser and a welding time are adjusted so that the extension of the
Schweißverbindung in Richtung der Höhe H zumindest abschnittsweise größer ist als die Höhe H des gemeinsamen Leiterquerschnitts 9. Welded joint in the direction of the height H at least partially greater than the height H of the common conductor cross-section. 9
Die miteinander verschweißten Leiterenden 5, insbesondere die Randabschnitte 10 der Leiterenden 5, können an ihren Kanten jeweils abgerundet ausgebildet sein, um durch das Vermeiden von Graten und Spitzen eine verringerte Feldlinienkonzentration und damit eine höhere Isolations- bzw. Durchschlagsfestigkeit zu erreichen. An den abgerundeten, miteinander verschweißten Leiterenden 5 kann nach dem  The welded together conductor ends 5, in particular the edge portions 10 of the conductor ends 5, may each be rounded at their edges to achieve by reducing burrs and peaks a reduced field line concentration and thus a higher insulation or dielectric strength. At the rounded, welded together conductor ends 5 can after the
Verschweißen eine nicht dargestellte, elektrisch isolierende Isolationsbeschichtung aufgebracht werden. Durch die Abrundung der miteinander verschweißten Leiterenden 5 weist die Isolationsbeschichtung an den verschweißten Leiterenden 5 eine gleichmäßigere Schichtdicke auf als bei nicht abgerundeten Leiterenden 5. Ohne die Abrundung der Leiterenden 5 würde die Isolationsbeschichtung an den Kanten, Graten oder Spitzen der Leiterenden 5 eine geringere Schichtdicke aufweisen, so dass dort die Isolations- bzw. Durchschlagsfestigkeit verringert wäre. Die Abrundung der Leiterenden 5 kann bereits vor dem Verschweißen der Leiterenden 5 beispielsweise durch mechanische Bearbeitung oder beim Schweißprozess durch Aufschmelzen der Kanten oder nach dem Verschweißen durch mechanische Bearbeitung hergestellt werden. Fig.3 zeigt eine Draufsicht auf die Stirnseite der Leiterenden mit der Welding an unillustrated, electrically insulating insulation coating can be applied. By rounding the welded together conductor ends 5, the insulation coating on the welded conductor ends 5 a More uniform layer thickness than with non-rounded conductor ends 5. Without the rounding of the conductor ends 5, the insulation coating at the edges, ridges or tips of the conductor ends 5 would have a smaller layer thickness, so that there the insulation or dielectric strength would be reduced. The rounding of the conductor ends 5 can be made by welding the conductor ends 5, for example by mechanical processing or welding process by melting the edges or after welding by mechanical processing. 3 shows a plan view of the end face of the conductor ends with the
Schweißverbindung nach Fig.2. Bei der Ansicht nach Fig.3 sind die gegenüber der Ansicht nach Fig.l und Fig.2 gleichbleibenden oder gleichwirkenden Teile durch die gleichen Bezugszeichen gekennzeichnet.  Welded joint according to Fig.2. In the view according to FIG. 3, the parts which are identical or functionally identical to the view according to FIG. 1 and FIG. 2 are identified by the same reference numerals.

Claims

Ansprüche claims
Stator einer elektrischen Maschine mit Statornuten (3) und in den Statornuten (3) angeordneten Leiterelementen (4), die jeweils zwei Leiterenden (5) haben, wobei mehrere nebeneinander liegende Leiterenden (5) verschiedener Leiterelemente (4) jeweils mittels einer an den Stirnseiten (6) der betreffenden Leiterenden (5) vorgesehenen Schweißverbindung (8) ohne Zusatzwerkstoff miteinander verbunden sind, wobei die miteinander verbundenen Leiterenden (5) jeweils einen gemeinsamen viereckigen Leiterquerschnitt (9) bilden, der eine Höhe (H) und eine Breite (B) aufweist, wobei die Höhe (H) der Höhe (h) eines Einzelquerschnitts der Leiterenden (5) entspricht und sich die Breite (B) des gemeinsamen Stator of an electrical machine having stator slots (3) and conductor elements (4) arranged in the stator slots (3), each having two conductor ends (5), wherein a plurality of adjacent conductor ends (5) of different conductor elements (4) are each connected to the end faces (6) of the respective conductor ends (5) provided weld joint (8) are interconnected without filler material, wherein the interconnected conductor ends (5) each have a common square conductor cross section (9) having a height (H) and a width (B) , wherein the height (H) of the height (h) corresponds to a single cross-section of the conductor ends (5) and the width (B) of the common
Leiterquerschnitts (9) aus der Summe der Breiten (b) der Einzelquerschnitte der Leiterenden (5) ergibt, wobei die Schweißverbindung (8) jeweils in Richtung der Breite (B) gesehen zwischen zwei nicht aufgeschmolzenen Randabschnitten (10) der äußersten Leiterenden (5) vorgesehen ist, dadurch gekennzeichnet, dass die Erstreckung (L2) der Schweißverbindung (8) in Richtung der Höhe (H) zumindest abschnittsweise größer ist als die Höhe (H) des gemeinsamen Leiterquerschnitts (9) und die Oberfläche der Schweißverbindung (8) in Bezug auf die Stirnseiten (6) der Randabschnitte (10) infolgedessen eingesunken ist.  Conductor cross section (9) from the sum of the widths (b) of the individual cross sections of the conductor ends (5) results, wherein the welded joint (8) in each case in the direction of the width (B) seen between two unfused edge portions (10) of the outermost conductor ends (5) is provided, characterized in that the extension (L2) of the welded joint (8) in the direction of the height (H) is at least partially greater than the height (H) of the common conductor cross section (9) and the surface of the welded joint (8) with respect on the end faces (6) of the edge portions (10) is sunken as a result.
Stator nach Anspruch 1, dadurch gekennzeichnet, dass die Schweißverbindung (8) in Richtung der Höhe (H) gesehen gegenüber den Randabschnitten (10) der äußersten Leiterenden (5) vorsteht. Stator according to claim 1, characterized in that the weld joint (8) protrudes in the direction of the height (H) from the edge portions (10) of the outermost conductor ends (5).
Stator nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Oberfläche der Schweißverbindung (8) über die gesamte Längserstreckung (LI) der Schweißverbindung (8) eingesunken ist. Stator according to one of the preceding claims, characterized in that the surface of the welded joint (8) is sunk over the entire longitudinal extent (LI) of the welded joint (8).
Stator nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Schweißverbindung (8) bei einer Draufsicht auf die Stirnseiten (6) der betreffenden Leiterenden (5) ovalförmig ausgebildet ist. Stator according to one of the preceding claims, characterized in that the welded connection (8) is oval-shaped in a plan view of the end faces (6) of the relevant conductor ends (5).
5. Stator nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Schweißverbindung (8) in Richtung der Längserstreckung (LI) der 5. Stator according to one of the preceding claims, characterized in that the welded connection (8) in the direction of the longitudinal extent (LI) of the
Schweißverbindung (8) gesehen einen ovalförmigen Querschnitt hat. 6. Stator nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Verhältnis der Breite (B) zur Höhe (H) des gemeinsamen Leiterquerschnitts (9) größer als zwei ist.  Welded joint (8) has seen an oval-shaped cross-section. 6. Stator according to one of the preceding claims, characterized in that the ratio of the width (B) to the height (H) of the common conductor cross-section (9) is greater than two.
7. Stator nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Einzelquerschnitt der Leiterenden (5) jeweils eine Höhe (h) und eine Breite (b) aufweist, wobei das Verhältnis von der Breite (b) zur Höhe (h) des 7. Stator according to one of the preceding claims, characterized in that the individual cross section of the conductor ends (5) each have a height (h) and a width (b), wherein the ratio of the width (b) to the height (h) of
Einzelquerschnitts der Leiterenden (5) jeweils größer gleich eins ist.  Single cross section of the conductor ends (5) is greater than or equal to one.
8. Stator nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Einzelquerschnitt der Leiterenden (5) jeweils quadratisch oder rechteckförmig, insbesondere mit abgerundeten Kanten, ausgebildet ist. 8. Stator according to one of the preceding claims, characterized in that the individual cross section of the conductor ends (5) in each case square or rectangular, in particular with rounded edges, is formed.
9. Stator nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die miteinander verbundenen Leiterenden (5), insbesondere die Randabschnitte (10), abgerundet ausgebildet sind. 9. Stator according to one of the preceding claims, characterized in that the interconnected conductor ends (5), in particular the edge portions (10), are rounded.
10. Stator nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Schweißverbindung (8) von einer elektrischen Isolation umgeben ist. 11. Verfahren zum Herstellen einer Schweißverbindung (8) nach einem der 10. Stator according to one of the preceding claims, characterized in that the welded connection (8) is surrounded by an electrical insulation. 11. A method for producing a welded joint (8) according to one of
vorhergehenden Ansprüche, umfassend die Schritte:  preceding claims, comprising the steps:
- Abisolieren der zu verbindenden Leiterenden (5), Stripping the conductor ends (5) to be connected,
- Nebeneinander Anordnen der Leiterenden (5),  Arranging the conductor ends (5) side by side,
- Lokales Aufschmelzen des Werkstoffes an den Stirnseiten (6) der  - Local melting of the material at the end faces (6) of the
Leiterenden(5) durch pendelndes Hin- und Herbewegen eines Laserstrahls, wobei der Verschwenkbereich des Lasers derart eingestellt ist, dass das sich bildende Schweißbad zwischen einem nicht aufgeschmolzenen Randbereich (10) eines der beiden äußersten Leiterelemente (4) und einem nicht aufgeschmolzenen Randbereich (10) des anderen äußersten Leiterelementes Conductor ends (5) by oscillating reciprocating a laser beam, wherein the pivoting range of the laser is set such that the forming weld pool between a non-melted edge region (10) of one of the two outermost conductor elements (4) and a non-melted edge region (10 ) of the other outermost conductor element
(4) gehalten ist, - Einstellen der Schweißparameter, insbesondere der Leistung des Lasers, einer Strahldicke des Lasers und einer Schweißzeit, derart, dass die Erstreckung (L2) der Schweißverbindung (8) in Richtung der Höhe (H) zumindest abschnittsweise größer ist als die Höhe (H) des gemeinsamen (4) is held, Adjusting the welding parameters, in particular the power of the laser, a beam thickness of the laser and a welding time such that the extent (L2) of the welded connection (8) in the direction of the height (H) is at least partially greater than the height (H) of the common
Leiterquerschnitts (9).  Conductor cross section (9).
12. Verfahren nach Anspruch 11, zusätzlich umfassend den Schritt 12. The method of claim 11, further comprising the step
Aufbringen einer Isolationsbeschichtung auf die miteinander verschweißten Leiterenden.  Applying an insulation coating on the welded together conductor ends.
EP17722788.1A 2016-07-08 2017-05-11 Stator of an electrical machine Pending EP3482478A1 (en)

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DE102016212510 2016-07-08
DE102017200688.9A DE102017200688A1 (en) 2016-07-08 2017-01-17 Stator of an electric machine
PCT/EP2017/061286 WO2018007060A1 (en) 2016-07-08 2017-05-11 Stator of an electrical machine

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FR3098745B1 (en) * 2019-07-15 2022-06-24 Nidec Psa Emotors Welding process without addition of material
DE102019119666A1 (en) * 2019-07-19 2021-01-21 Gehring E-Tech Gmbh Method for welding conductor pieces in a component of an electromechanical transducer and component of an electromechanical transducer with welded conductor pieces
CN114583864B (en) * 2022-03-24 2024-02-23 浙江极氪智能科技有限公司 Motor winding and stator assembly

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DE102017200688A1 (en) 2018-01-11

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